Solución
18
u
2
⋅
7
=
18
(
7
x
−
4
)
2
⋅
7
18{u^2} \cdot 7 = 18{\left( {7x - 4} \right)^2} \cdot 7
18
u
2
⋅
7
=
18
(
7
x
−
4
)
2
⋅
7